I've had a bit of practice now desoldering DIPs, so here are some of my desoldering DIPs tips.
I use a cheap desoldering station, you can heat the work quickly then pull the trigger. I've used manual solder suckers in the past and man I suck at using them, but the desoldering station, bang done. https://www.youtube.com/watch?v=Ft50m8UU5WQ
After inspection, if there is a lot of solder on some pins still (where it went right through the via normally) add some new solder and repeat the process again. Putting fresh solder on initially helps as well. I use a microscope and some ESD tweezers to have a good look.
Don't pull the IC's initially. If you give them a little side ways twisting motion you can usually see which pins are not free. Big dips are quite hard to remove and need more patience as the leg count increases.
For troublesome pins you'll need some flux and some desoldering braid. While running the braid down the pins with the soldering iron, just push the pins into the body of the dip. This helps get the pin off of the via and gets all the solder off of it.
Once you can give it a twist and see that all pins are moving freely you can pull it, with care.
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